import signal
import time
import sys
from testutils import assert_raises

assert_raises(TypeError, lambda: signal.signal(signal.SIGINT, 2))

signals = []


def handler(signum, frame):
    signals.append(signum)


signal.signal(signal.SIGILL, signal.SIG_IGN)
assert signal.getsignal(signal.SIGILL) is signal.SIG_IGN

old_signal = signal.signal(signal.SIGILL, signal.SIG_DFL)
assert old_signal is signal.SIG_IGN
assert signal.getsignal(signal.SIGILL) is signal.SIG_DFL


# unix
if "win" not in sys.platform:
    signal.signal(signal.SIGALRM, handler)
    assert signal.getsignal(signal.SIGALRM) is handler

    signal.alarm(1)
    time.sleep(2.0)
    assert signals == [signal.SIGALRM]

    signal.signal(signal.SIGALRM, signal.SIG_IGN)
    signal.alarm(1)
    time.sleep(2.0)

    assert signals == [signal.SIGALRM]

    signal.signal(signal.SIGALRM, handler)
    signal.alarm(1)
    time.sleep(2.0)

    assert signals == [signal.SIGALRM, signal.SIGALRM]
